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Exam DP-700 topic 1 question 5 discussion

Actual exam question from Microsoft's DP-700
Question #: 5
Topic #: 1
[All DP-700 Questions]

You have a Fabric F32 capacity that contains a workspace. The workspace contains a warehouse named DW1 that is modelled by using MD5 hash surrogate keys.
DW1 contains a single fact table that has grown from 200 million rows to 500 million rows during the past year.
You have Microsoft Power BI reports that are based on Direct Lake. The reports show year-over-year values.
Users report that the performance of some of the reports has degraded over time and some visuals show errors.
You need to resolve the performance issues. The solution must meet the following requirements:
Provide the best query performance.
Minimize operational costs.
Which should you do?

  • A. Change the MD5 hash to SHA256.
  • B. Increase the capacity.
  • C. Enable V-Order.
  • D. Modify the surrogate keys to use a different data type.
  • E. Create views.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by IshtarSQL at Dec. 6, 2024, 8:45 p.m.

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Tuki93
Highly Voted 3 months, 3 weeks ago
Selected Answer: C
Enable V-Order: This should be your first step as it directly targets performance improvements with minimal cost. Consider the following before deciding to disable V-Order: Microsoft Fabric Direct Lake mode depends on V-Order. https://learn.microsoft.com/en-us/fabric/data-warehouse/v-order#performance-considerations
upvoted 11 times
Adriel_1996
1 week, 1 day ago
What about the limit on the rows limitation (https://learn.microsoft.com/en-us/fabric/fundamentals/direct-lake-overview) ?
upvoted 1 times
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GHill1982
3 months, 1 week ago
Would V-Order not already be enabled by default?
upvoted 3 times
h2o_molecule
1 month, 3 weeks ago
is V-order automatically enabled on warehouse? No, V-Order is not automatically enabled on a warehouse. You would need to enable it manually to take advantage of its benefits for improved query performance and data compression.
upvoted 2 times
dazero
1 month ago
V-order is enabled by default.
upvoted 3 times
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Raibeth
1 month, 4 weeks ago
I still have the same doubt.
upvoted 2 times
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IshtarSQL
Highly Voted 3 months, 3 weeks ago
Selected Answer: D
While MD5 hashes are deterministic and ensure uniqueness, they can be less efficient for join operations compared to integer-based keys. This inefficiency arises because joining on lengthy string keys demands more computational resources than joining on shorter, integer-based keys. Recommendation: Modify the surrogate keys to use a different data type, specifically integers.
upvoted 8 times
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kumarzzz
Most Recent 4 days, 3 hours ago
Selected Answer: D
My suggestion to be both things To minimize operational costs, you can modify surrogate keys by using a smaller integer data type (e.g., INT instead of BIGINT) and enabling V-order (Virtual Order) for faster data retrieval, if applicable.
upvoted 1 times
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MultiCloudIronMan
3 weeks, 6 days ago
Selected Answer: C
Changing the surrogate key data type would likely involve significant re-engineering efforts without guaranteeing a performance improvement.
upvoted 2 times
zxc01
6 days, 3 hours ago
V-Order in fabric warehouse is enabled by default, and you cannot disable it.
upvoted 1 times
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Sher_Lock_Alexa
1 month ago
Selected Answer: C
V-Order is a highly optimized columnar storage format in Microsoft Fabric that compresses and accelerates queries
upvoted 2 times
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hebertorosillo
1 month ago
Selected Answer: D
B. Minimize operational costs is false. A. Distraction. C. Warehouse is not possible in this sentence. V-Order is configured in a notebook because it is incorrect. D. It is true because https://learn.microsoft.com/en-us/fabric/data-engineering/delta-optimization-and-v-order?tabs=sparksqlit reduces and increments performance by utilizing minimal operational costs.
upvoted 2 times
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dazero
1 month ago
Selected Answer: B
500 million rows is over the F32 table limit.
upvoted 6 times
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ChenFu
1 month, 1 week ago
Selected Answer: C
V-Order is a storage optimization format used in Microsoft Fabric for Delta tables. It organizes data in a highly compressed and sorted format, improving query performance while reducing storage costs. Since your reports are based on Direct Lake, enabling V-Order will directly enhance read performance without increasing operational costs. Increasing capacity (B) would add cost, while changing hash keys (A) or modifying data types (D) are more complex and don't guarantee significant performance gains. Creating views (E) does not optimize the underlying storage and, therefore, won't address the root cause effectively.
upvoted 2 times
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henryphchan
1 month, 2 weeks ago
Selected Answer: D
V-Ordering is enabled by default in Fabric Datawarehouse. I have created a new datawarehouse and verify the default v-order status: SELECT [name], [is_vorder_enabled] FROM sys.databases; Disabling V-Order is irreversible: once disabled, it cannot be enabled again. So C is not a valid option. https://learn.microsoft.com/en-us/fabric/data-warehouse/v-order
upvoted 2 times
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clux
1 month, 3 weeks ago
Selected Answer: C
V-Order improves read performance by applying special optimizations such as sorting, row group distribution, dictionary encoding, and compression on Parquet files. This enhances query performance significantly, especially for large datasets. Additionally, V-Order is cost-effective as it reduces the amount of resources needed for reading data, leading to improved performance without increasing operational costs.
upvoted 1 times
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prabhjot
1 month, 3 weeks ago
Selected Answer: C
i think the answer should be V-order since it will sort data before writing and hence give you better read performance without increasing the capacity which also optimizes on operational costs!
upvoted 1 times
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h2o_molecule
1 month, 3 weeks ago
Selected Answer: C
V-Order is a columnar storage format that optimizes data storage and retrieval. It can significantly improve query performance and reduce storage costs by compressing data and minimizing the amount of data read during queries. This makes it a suitable choice for large fact tables and scenarios where you need to improve performance without increasing operational costs.
upvoted 1 times
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robertlavigne
2 months, 1 week ago
Selected Answer: B
B. Although B is expensive I think it is the only viable option. https://learn.microsoft.com/en-us/fabric/get-started/direct-lake-overview See the table on Directlake limitations in the above link. For F32 it is 300 million rows before direct query fallback occurs. For F64 it is 1500 million rows. V Order or Key modification don't minimize the row count and won't avoid these limitations. Views aren't supported in DirectLake and will always fallback to direct query so thats not helpful.
upvoted 6 times
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i_have_a_name
2 months, 2 weeks ago
Selected Answer: D
SHA26 generates a 64 character length key, which will affect the performance further. V-Order is enabled by default in Fabric. Modifying the surrogate key should be the cost effective solution.
upvoted 3 times
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mixonfreddy
3 months ago
Selected Answer: D
You have to modify the surrogate keys
upvoted 4 times
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manolet
3 months, 1 week ago
Selected Answer: C
Changing surrogate keys is not a straightforward solution. The key is that you need to make the decision based on minimizing operational cost.
upvoted 2 times
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QAZdbarhate12345678
3 months, 2 weeks ago
Selected Answer: D
The best solution to resolve the performance issues while meeting the requirements of best query performance and minimizing operational costs is: D. Modify the surrogate keys to use a different data type.
upvoted 4 times
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